PIC16C622-20I/SS - 8-bit EPROM MCU, 3.5KB, 13 I/O | Microchip
MPN: PIC16C622-20I/SS ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.26 | $2.26 |
| 10 | $2.04 | $20.40 |
| 100 | $1.81 | $181.00 |
| 500 | $1.62 | $810.00 |
| 1,000 | $1.44 | $1,440.00 |
PIC16C622-20I/SS Overview
A microcontroller (MCU) is a single-chip computer containing a CPU, non-volatile program memory, volatile data memory, and programmable peripherals. PIC microcontrollers use a RISC (Reduced Instruction Set Computer) Harvard architecture that separates program and data buses, allowing simultaneous instruction fetch and data read for higher throughput than von-Neumann designs at the same clock rate. PIC16C-series parts are one-time-programmable (OTP) EPROM variants targeted at cost-sensitive volume production where code stability has been finalized.
Key features include 13 bidirectional I/O pins with individual direction control, a 20 MHz internal execution rate (200 ns instruction cycle), one 8-bit timer/counter and one 16-bit timer/counter, an analog comparator, and an internal/ external oscillator option. The device draws approximately 2 mA at 5V/4 MHz and less than 1 uA in standby, making it well suited to battery-powered instrumentation. Watchdog timer and power-on reset are integrated for unattended embedded deployments.
The PIC16C622-20I/SS uses Microchip's mid-range 14-bit instruction set shared across the PIC16F/C/CR family, with 35 single-word instructions. Development is supported by MPLAB X IDE, MPLAB XC8 compiler, and the PICkit 3/4 programmers, allowing code migration to flash-based PIC16F variants when production volumes justify the conversion from OTP EPROM. The SSOP-20 footprint is shared with PIC16C620A, PIC16C621A, and PIC16F628 families, enabling PCB reuse across device grades.
Typical applications include low-cost industrial controls, appliance control boards, sensor signal conditioning, simple PWM motor drivers, and battery-powered handheld instruments where SSOP-20 footprint, EPROM one-time programmability, and proven PIC16 mid-range toolchain support are decisive selection criteria.
When designing with this device, plan code migration paths early: OTP EPROM cannot be re-programmed, so any firmware bug becomes a scrapped PCB. Also budget a 100 nF decoupling capacitor adjacent to VDD with a wide ground return, and respect the 6.0V absolute maximum to avoid latch-up in industrial bus-powered designs.
This page combines distributor pricing, parametric alternatives, and design considerations not collated on the manufacturer datasheet to accelerate sourcing and board bring-up.
Drop-in alternatives for PIC16C622-20I/SS — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with PIC16C622-20I/SS (same form factor and footprint) — differing in Timers, Watchdog Timer, Program Memory Size, Operating Temperature Range, Program Memory Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C622-20/SS
✅ Drop-In✓ In Stock
$1.38 / Unit
View Datasheet →PIC16C622-20E/SS
✅ Drop-In✓ In Stock
$2.49 / Unit
View Datasheet →PIC16C622-04/SS
✅ Drop-In✓ In Stock
$1.18 / Unit
View Datasheet →PIC16C621A-20I/SS
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
PIC16C620A-20I/SS
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$2.15 / Unit
View Datasheet →PIC16F628A-I/SS
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
PIC16F72-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C622-20I/SS Maximum Ratings & Electrical Characteristics
| Program Memory Size | 3.5 KB (2K x 14) EPROM |
| RAM Size | 128 x 8 bytes |
| Number of I/O | 13 |
| CPU Speed | 20 MHz |
| Supply Voltage Range | 2.5 V to 6.0 V |
| Oscillator Type | External |
| Package / Case | 20-SSOP (0.209, 5.30 mm Width) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40 C to +85 C (Industrial) |
| Core | PIC16 (14-bit RISC) |
| Instruction Set | 35 instructions, single cycle |
| Timers | 1 x 8-bit, 1 x 16-bit |
| Program Memory Type | OTP EPROM |
| Data EEPROM | Not present on PIC16C622 |
| Analog Comparator | Yes |
| Watchdog Timer | Yes |
| Power-On Reset | Yes |
| MSL Level | 1 (unlimited at <=30 C/85% RH) |
| RoHS Status | Non-compliant (contains Pb in EPROM windowed versions; SSOP no-window is Pb-free per Microchip product page) |
| Lead-Free Finish | Yes (matte tin, SSOP non-windowed) |
PIC16C622-20I/SS Pin Configuration
| Pin 1 | RA2 — Bidirectional I/O port A bit 2 |
| Pin 2 | RA3 — Bidirectional I/O port A bit 3 |
| Pin 3 | RA4/T0CKI — I/O port A bit 4 / Timer0 clock input |
| Pin 4 | MCLR/VPP — Master clear (reset) / programming voltage |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RB0/INT — I/O port B bit 0 / external interrupt |
| Pin 7 | RB1 — I/O port B bit 1 |
| Pin 8 | RB2 — I/O port B bit 2 |
| Pin 9 | RB3 — I/O port B bit 3 |
| Pin 10 | RB4 — I/O port B bit 4 |
| Pin 11 | RB5 — I/O port B bit 5 |
| Pin 12 | RB6 — I/O port B bit 6 |
| Pin 13 | RB7 — I/O port B bit 7 |
| Pin 14 | VDD — Positive supply |
| Pin 15 | OSC2/CLKOUT — Oscillator output / external clock out |
| Pin 16 | OSC1/CLKIN — Oscillator input / external clock in |
| Pin 17 | RA0/AN0 — I/O port A bit 0 / analog comparator CH1 |
| Pin 18 | RA1/AN1 — I/O port A bit 1 / analog comparator CH2 |
| Pin 19 | VSS — Ground reference |
| Pin 20 | VDD — Positive supply |
Typical Applications
PIC16C622-20I/SS is suitable for 7 applications: Appliance Control Boards, Industrial Sensor Conditioning, Battery-Powered Handheld Instruments, Simple PWM Motor Drivers, Low-Cost Consumer Remote Controls, Automotive Body Electronics (Legacy Nodes), Educational and Hobby Projects.
Appliance Control Boards
The PIC16C622-20I/SS fits white-goods control boards where the SSOP-20 footprint, OTP EPROM, and 20 MHz execution rate are sufficient to scan keypads, drive triac-fired loads, and run a small PID loop. With 3.5 KB of EPROM holding roughly 2000 fourteen-bit words, the firmware can implement a full wash-cycle state machine, water-level sensor debouncing, and triac zero-cross timing on a single chip. The 13 I/O pins map to seven-segment LED segments, button rows, motor direction, and door-lock control, with the analog comparator used for line-voltage zero-cross detection. Designers benefit from the part's USD 1.44-at-qty-1000 cost and Microchip's long-term PIC16 mid-range toolchain stability, even though the silicon is in its mature lifecycle.
Recommended
Industrial Sensor Conditioning
For industrial 4-20 mA loop-powered sensor conditioning nodes, the PIC16C622-20I/SS provides 128 bytes of RAM, a 16-bit timer/counter for accurate period measurement, and an analog comparator for threshold detection, all within a SSOP-20 outline that fits inside a DIN-rail transmitter housing. The 2.5 V to 6.0 V supply range interfaces directly to a 5 V regulated loop with no level shifter. The OTP EPROM and -40 C to +85 C industrial temperature range suit remote, inaccessible field installations where firmware updates are unnecessary. Typical firmware implements period counting from a frequency-output flow sensor and HART-style modulation on the loop. The 13 I/O pins accommodate up to four digital sensors plus the loop interface.
Recommended
Battery-Powered Handheld Instruments
Battery-powered handheld instruments benefit from the PIC16C622-20I/SS drawing under 1 uA in standby and approximately 2 mA at 5V/4 MHz active. The OTP EPROM eliminates the standby current that flash memory normally draws, extending coin-cell runtime in intermittent-duty products like infrared thermometers, gas-leak sniffers, and HVAC service tools. The 20 MHz execution rate enables on-the-fly thermocouple linearization with a 50 ms response time. The SSOP-20 package (5.30 mm body) populates a single-layer PCB that fits inside a handheld enclosure. Designers should budget for a low-battery voltage divider feeding the analog comparator to trigger graceful shutdown below 2.5 V.
Recommended
Simple PWM Motor Drivers
For small brushed-DC or uni-polar stepper motor drivers in fans, pumps, and conveyor controls, the PIC16C622-20I/SS generates PWM using its 16-bit timer/counter at up to 20 MHz, allowing 10-bit PWM resolution at 20 kHz switching frequency with no peripheral overhead. The 13 I/O pins drive a logic-level MOSFET gate driver, brake input, tachometer feedback, and fault LED. The OTP EPROM locks the motor-control algorithm to prevent field tampering. A 20 MHz CPU handles closed-loop PID at 1 kHz update rate while leaving headroom for keypad scan and display refresh. The 128-byte RAM is sufficient for trapezoidal-velocity profile tables up to 64 entries.
Recommended
Low-Cost Consumer Remote Controls
RF and IR remote-control transmitters are a natural fit for the PIC16C622-20I/SS because the OTP EPROM locks the device-pairing code into silicon, preventing consumer-side cloning, while the 20 MHz execution rate handles rolling-code encryption and button-matrix scan on a single chip. The 13 I/O pins drive a 4x5 button matrix plus a status LED and IR LED, with the analog comparator used as a low-battery detector. The SSOP-20 (5.30 mm) fits inside a standard AAA-battery holder. Designers integrate a PP RF transmitter module and benefit from the part's USD 1.44-at-qty-1000 cost, which is competitive against dedicated remote-control encoder ICs at high volume.
Recommended
Automotive Body Electronics (Legacy Nodes)
The PIC16C622-20E/SS extended-temperature variant (-40 C to +125 C) supports legacy automotive body-electronics nodes where the 13-bit I/O count, OTP EPROM, and SSOP-20 footprint match existing PCB layouts, such as window-lift switches, mirror adjusters, and interior lighting controllers. The 20 MHz execution handles LIN-like software-UART protocols at 19.2 kbaud with timing headroom. Designers must source the extended-temperature grade for under-hood or sun-exposed applications; the standard PIC16C622-20I/SS industrial grade is limited to -40 C to +85 C. Note that AEC-Q100 automotive qualification is not stated for this part, so consult Microchip's PCN for the latest automotive-grade ordering codes.
Recommended
Educational and Hobby Projects
Hobbyist and educational labs use the PIC16C622-20I/SS because the PIC16 mid-range instruction set is well-documented in Microchip application notes and supported by the free MPLAB X IDE and XC8 compiler. The SSOP-20 footprint populates widely available breakout boards and breadboard adapters. The OTP EPROM forces students to plan firmware carefully, mirroring professional embedded constraints where bugs cannot be patched in the field. The 20 MHz execution rate provides real-time responsiveness for line-following robots, simple motor control, and sensor-driven projects, while the 13 I/O pins accommodate multiple LEDs, buttons, and servos. Developers appreciate the migration path to PIC16F628A-I/SS for the same footprint when flash reprogrammability becomes desirable.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C622-20I/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C622-20/SS | PIC16C622-20E/SS | PIC16C622-04/SS | PIC16C621A-20I/SS | PIC16F628A-I/SS |
|---|---|---|---|---|---|---|
| Package | 20-SSOP | 20-SSOP | 20-SSOP | 20-SSOP | 20-SSOP | 20-SSOP |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 3.5 KB EPROM | 3.5 KB EPROM | 3.5 KB EPROM | 3.5 KB EPROM | 1.75 KB EPROM | 3.5 KB Flash |
| Maximum Clock | 20 MHz | 20 MHz | 20 MHz | 4 MHz | 20 MHz | 20 MHz |
| Temperature Grade | -40C to +85C (Industrial) | 0C to +70C (Commercial) | -40C to +125C (Extended) | 0C to +70C (Commercial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) |
| Memory Technology | OTP EPROM | OTP EPROM | OTP EPROM | OTP EPROM | OTP EPROM | Flash |
| Internal Oscillator | No (external only) | No | No | No | No | Yes (4 MHz + 37 kHz) |
| Lifecycle | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Active |
Key Differentiators
- Largest EPROM in the PIC16C62X SSOP-20 family (vs PIC16C621A-20I/SS)
- Extended-temperature -40C to +125C variant available in same package (vs PIC16C622-20I/SS)
- Lower per-unit cost than flash-based successor (vs PIC16F628A-I/SS)
Design Notes
OTP EPROM cannot be electrically re-programmed: a single bit error in production firmware forces PCB scrap. According to Microchip application note AN545, code is typically verified on a PIC16F-series windowed or flash equivalent before being committed to PIC16C-series OTP devices. Use PIC16F628A-I/SS as the development surrogate, then freeze the firmware and qualify the PIC16C622-20I/SS only when the code is final. MOC top control must include watchdog timer enable and brown-out reset configuration to prevent field lockups.
Place a 100 nF ceramic decoupling capacitor adjacent to the VDD pin (pin 14) with a short, wide trace to the VSS pin (pin 19) on the same SSOP package. According to Microchip PIC16C62X datasheet, the analog comparator reference section is sensitive to supply noise; a separate 10 uF bulk capacitor at the PCB power entry plus 100 nF per VDD pin suppresses switching transients from relay or triac loads. Keep digital return currents away from the analog comparator pins (RA0/RA1).
The PIC16C622-20I/SS requires an external clock source on OSC1/OSC2 (pins 15 and 16). For 20 MHz operation, use a fundamental-mode AT-cut crystal with 15-33 pF load capacitors sized per the crystal vendor's CLoad specification. For low-power 32.768 kHz designs, use a watch crystal with 6-10 pF load capacitors. PCB layout must keep the crystal traces short and enclosed by a ground ring to minimize EMI pickup that can cause clock jitter and erratic timer/counter behavior.
Estimated: at 5V supply, 20 MHz active CPU, and all 13 I/O pins sourcing 20 mA each, total dissipation reaches approximately 130 mW plus I/O power. The 20-SSOP package has a typical theta_JA of 100 C/W on a 1-oz 2-layer board, giving a junction-temperature rise of roughly 13 C above ambient at full output swing. For sealed enclosures with no airflow, derate by 50% to keep Tj below 70 C. The industrial -40 C to +85 C temperature grade limits operation to that window; for higher temperatures use PIC16C622-20E/SS extended grade.
Compliance Information
SSOP non-windowed package is lead-free matte tin and RoHS compliant per Microchip product page. AEC-Q100 automotive qualification is not stated for PIC16C622-20I/SS; consult Microchip PCN for automotive-grade ordering codes. CERDIP windowed variants contain Pb in glass frit and are not RoHS compliant.
